A two-plate lapping machine with comparator for continuously measuring the workpiece tichness

(19)

(11)

EP 0 241 433 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	26.07.1989 Bulletin 1989/30

(43)	Date of publication A2:
	14.10.1987 Bulletin 1987/42

(21)	Application number: 87830086.2

(22)	Date of filing: 05.03.1987

(51)	International Patent Classification (IPC)⁴: B24B 37/04

(84)	Designated Contracting States:
	CH DE FR GB LI

(30)

Priority:

07.03.1986 IT 4773886

(71)	Applicant: MELCHIORRE Off. Mecc.-S.r.l.
	I-20092 Cinisello Balsamo (IT)

(72)	Inventor:
	Melchiorre, Michele Milano (IT)

(74)	Representative: Sarpi, Maurizio
	Studio FERRARIO Via Collina, 36 00187 Roma 00187 Roma (IT)

(56)

References cited: :

(54)	A two-plate lapping machine with comparator for continuously measuring the workpiece tichness

(57) in a lapping machine provided with two lapping plates with satellites rotated by a crown gear which is internal to the plate which satellites roll on outer ring gear along the periphery of the same plate, a comparator is mounted provided with two points between which, as between shears, in succession, a limb is taken of all the rotating satellites which all project from the lapping plate; at least a portion of a piece to be lapped being continued in said limb whereby the vertical thickness of said piece is measured.
Due to the suitable ratio being chosen between the number of teeth of the lapping plates and the number of the satellite teeth it is obtained that the measurement carried out on a workpiece for each satellite is continuously repeated.
A device is also provided for restorings the alignment of the two points of the comparator when the lower plate is worn; a device for facilitating the charging and the discharging of the satellites all filled of the workpieces being lapped is also provided.

Search report